The 'cell factory?", what exactly is

So I was see this term a lot on forums, as well as the http://docs.oracle.com/javafx/2/ui_controls/table-view.htm and all, but I'm not 100% sure that it's... It seems that just a method to set the data to the tables, like the model of table? Someone at - it a more in depth than in the docs explaining, I'd appreciate it!

Thank you

~ KZ

Cell factories create cells. A cell is a labelled node that contains additional properties and methods to maintain a State of the selection and editing as well as a link to a cell value. Cells are used in a few places in JavaFX, for example in ListView and make, as well as TreeTables and ComboBoxes. The cell is the Visual representation (node), which corresponds to an element of data backup. The trick is that there is not necessarily a correspondence to a static between the cells and the data values.

Let's take an example. This is an empty ListView in a scene. When I run the app, it displays the ListView to his height, with 17 lines.

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.scene.layout.*;
import javafx.stage.Stage;

public class ListViewSample extends Application {
  @Override public void start(Stage stage) {
    ListView listView = new ListView();

    VBox layout = new VBox();
    VBox.setVgrow(listView, Priority.ALWAYS);
    layout.getChildren().addAll(listView);
    stage.setScene(new Scene(layout));
    stage.show();
  }

  public static void main(String[] args) { launch(args); }
}

Each of these 17 rows is empty. No cell factory has been set, but you can see the light and dark shaded alternating lines. Each of these lines in the ListView corresponds to a cell and each cell has been generated by the ListView default cell factory. When I drag the lower border of the stage to increase the size of the stage, the list view increases in size. When I drag the lower border of the scene to reduce the size of the stage, the list view decreases in size. When the list view increases in volume, more lines are visible. Each of the new cells for the larger view of the list are generated by the cell factory on an as needs basis; i.e. the cells were not created when the application was first run but created only because there is a larger surface area available to the ListView in which ListView can display more cells visible.

Now everything's pretty boring so far. Add some data, by using the following line of code:

listView.setItems(FXCollections.observableArrayList("apple", "orange", "pear"));

Now, you will see the 'apple', 'pear' and 'orange' channels made in the first three cells of ListView again by using the factory default cell for the ListView. Again, it is quite annoying.

What we will do now is add some switches that change the observable list, support for the display of the list in response to certain actions of the user:

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.event.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;

import java.util.Collections;
import java.util.Comparator;

public class ListViewSample extends Application {
  @Override public void start(Stage stage) {
    final ListView listView = new ListView<>();
    listView.setItems(FXCollections.observableArrayList("apple", "orange", "pear"));

    ListViewSorter listViewSorter = new ListViewSorter(listView).invoke();

    VBox layout = new VBox(10);
    VBox.setVgrow(listView, Priority.ALWAYS);
    listView.setMinHeight(0);
    layout.getChildren().addAll(
        listView,
        HBoxBuilder
            .create()
            .spacing(10)
            .children(
                guavaCreator(listView),
                listViewSorter.getSorter(),
                listViewSorter.getReverser()
            )
            .build()
    );

    stage.setScene(new Scene(layout));
    stage.show();
  }

  private Button guavaCreator(final ListView listView) {
    final Button guavatron = new Button("Add Guava");
    guavatron.setOnAction(new EventHandler() {
      @Override public void handle(ActionEvent actionEvent) {
        listView.getItems().add("guava");
        guavatron.setDisable(true);
      }
    });
    return guavatron;
  }

  public static void main(String[] args) { launch(args); }

  private class ListViewSorter {
    private final ListView listView;
    private Button sorter;
    private Button reverser;

    public ListViewSorter(ListView listView) {
      this.listView = listView;
    }

    public Button getSorter() {
      return sorter;
    }

    public Button getReverser() {
      return reverser;
    }

    public ListViewSorter invoke() {
      sorter = new Button("Sort");
      sorter.setOnAction(new EventHandler() {
        @Override public void handle(ActionEvent actionEvent) {
          Collections.sort(listView.getItems());
        }
      });

      final Comparator REVERSE_SORT = new Comparator() {
        @Override  public int compare(String s1, String s2) {
          return -1 * s1.compareTo(s2);
        }
      };

      reverser = new Button("Reverse Sort");
      reverser.setOnAction(new EventHandler() {
        @Override public void handle(ActionEvent actionEvent) {
          Collections.sort(listView.getItems(), REVERSE_SORT);
        }
      });
      return this;
    }
  }
}

OK, now we have a few extra buttons, the button "Add guava" will create a new item ("guava"), the "Tri" and "Reverse the fate", buttons will change the sort order of the list of support. Now to understand what is happening behind the scenes when we use these buttons, let's take a look at the source code of the default list cell factory.

new ListCell() {
   @Override public void updateItem(Object item, boolean empty) {
     super.updateItem(item, empty);

     if (empty) {
       setText(null);
       setGraphic(null);
     } else if (item instanceof Node) {
       setText(null);
       Node currentNode = getGraphic();
       Node newNode = (Node) item;
       if (currentNode == null || ! currentNode.equals(newNode)) {
         setGraphic(newNode);
       }
     } else {
       setText(item == null ? "null" : item.toString());
       setGraphic(null);
     }
   }
 };

This code is one of the three things. If the cell in the list is empty, it sets the text and graphics on a null value, if you end up with an empty cell (the alternating gray bars light and darkness are generated by parent of the ListCell defining different classes of style on other cells). If the item is a node, it sets the chart to the node - this is the mechanism that allows to place nodes directly in the support list for the ListView and ListView to display their OK. Otherwise a toString is called on the element to set the text of the item (it is the case that occurs in our simple example strings in the list of backup).

Now, the important thing to note about the ListCell implementation, it is that the intelligent logic to translate the support element for the cell to a Visual representation occurs in an UpdateItem. The updateItem method is called by the system of JavaFX on the ListCell whenever the cell support element has been invalidated, for example, the item has been modified, added a new element or the items in the list have been reorganized.

So if someone clicks on the button "Add guava", a new ListCell is not created, rather updateItem is called on an already-existing empty cell. This is because when we started the application, there was space for 17 rows, so 17 cells were already created, it's just that most of them was empty, because we had only 3 elements in the support for the ListView list.

Now, if press us one of the sort buttons to reorder the list of support, it will cause the existing cells in the list become invalid and updateItem is called on each cell according to the permutations of change in the ObservableList. Note that each item is updated, a new display labeled for the element node is not created, instead, the setText method is called that changes the text to the labeled existing.

There are a few additional cases to understand. Our support list currently tops out at 4 elements. Let's say down us from our scene above so that the space available for the ListView was really small (for example only 2 rows high). In this case, you will have two rows (cell) and a scroll bar that you can use to scroll up and down. When you scroll up and down, it seems that some lines are scrolling off the screen and some are scrolling on the screen. What is actually happening, however, is that the same two cells remain on the screen and their content are continuously updated and replaced the support members come in and out of sight. This is the magic that ListView is able to achieve its effectiveness when it is potentially very large collections or collections where not all the necessary data are available on the client at the present time. Instead of creating Visual cells for all possible items that can be placed in the list, instead the ListView creates cells only for visible items and updates the content of these cells on a basis according to the needs. This concept is known in the jargon of creators of the list as a virtual flow cell in a virtualized control.

OK, so that was a little more interesting, but there was a lot of words so far and no factory custom cell. It was partly the purpose - there is a lot you can do with the factory of the cell by default without having to create your own custom cell factory.

But sometimes you actually want to create your own cell factory when you want precise control on the appearance or behavior of the cells.

Let's say you want to display each item in the list with a friendly name capitalized "Apple", "Orange" and "Pear" and an icon - matching a photo of the fruit. To do this, you create a cell factory - something that can produce the Visual representation of these things in the corresponding data values.

import javafx.application.Application;
import javafx.collections.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.image.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;
import javafx.util.Callback;

public class ListViewCustomCellFactorySample extends Application {
  ObservableMap iconMap = FXCollections.observableHashMap();

  @Override public void init() {
    iconMap.put(
      "apple",
      new Image(
        "http://uhallnyu.files.wordpress.com/2011/11/green-apple.jpg",
        0, 32, true, true
      )
    );
    iconMap.put(
      "orange",
      new Image(
        "http://i.i.com.com/cnwk.1d/i/tim/2011/03/10/orange_iStock_000001331357X_540x405.jpg",
        0, 32, true, true
      )
    );
    iconMap.put(
      "pear",
      new Image(
        "http://smoothiejuicerecipes.com/pear.jpg",
        0, 32, true, true
      )
    );
  }

  @Override public void start(Stage stage) {
    final ListView listView = new ListView<>();
    listView.setItems(FXCollections.observableArrayList("apple", "orange", "pear"));

    listView.setCellFactory(new Callback, ListCell>() {
      @Override public ListCell call(ListView stringListView) {
        return new LabeledIconListCell();
      }
    });

    VBox layout = new VBox(10);
    VBox.setVgrow(listView, Priority.ALWAYS);
    listView.setMinHeight(0);
    layout.getChildren().addAll(
        listView
    );
    stage.setScene(new Scene(layout));
    stage.show();
  }

  public static void main(String[] args) { launch(args); }

  private class LabeledIconListCell extends ListCell {
    @Override protected void updateItem(String item, boolean empty) {
      super.updateItem(item, empty);

      if (item != null) {
        String friendlyText = item.toString();
        if (item.length() > 0) {
          friendlyText = item.substring(0, 1).toUpperCase() + item.substring(1);
        }
        setText(friendlyText);

        setGraphic(
            StackPaneBuilder
                .create()
                .prefWidth(55)
                .children(
                    new ImageView(
                        iconMap.get(item)
                    )
                )
                .build()
        );
      } else {
        setText("");
        setGraphic(null);
      }
    }
  }
}

Here what did the cell factory is to check what is the value of the support of the cell element is whenever this element has been updated and a few custom label text and graphical representation for the cell.

As a minor point, efficiency, and because there are only a few of them, the necessary images are loaded and put across at the front so that they were not to be reloaded whenever the cell is updated with a different value (which if loading images under appeal updateItem cell could mean that the same image could potentially get loaded multiple times.)

My personal point of view on it is that it is powerful but complicated. Often, people are going to gravitate around using the ListView and TableView APIs complex when they do not necessarily all the features of effective functionality and virtualization that provide controls virtualized. In many cases, simple layout such VBoxes mechanisms and schedules may be a better choice. However, if you have a need for the virtualized functions, then it is good to know that things like ListView and TableView are there if you can work out how to use them in your case.

Also note that JavaFX 2.2 + a many practical methods for the creation of different cell types that you may be able to use in the standard cases to avoid overload by creating your own, for example the CheckBoxListCell, the ComboBoxListCell and the TextFieldListCell. And there are many more of these simplifying higher level abstractions in DataFX library.

Another interesting to observe point, it's that if you have a list of objects mutatable, for example the Person objects with a last variable name field, then you need to be the subject of an object Observable with an implementation of cancellation if you want the updateItem call in the cell factory is called automatically whenever the object mutates.

A plant cells and plant cell value are different things, but this is probably a topic for another post.

I know it was a long explanation and around - if all goes well he served something and helped explain some of the mysteries of the factories of the cell.

http://docs.Oracle.com/JavaFX/2/API/JavaFX/scene/control/cell.html
http://www.javafxdata.org
http://docs.Oracle.com/JavaFX/2/ui_controls/list-view.htm

Tags: Java

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Me

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75

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Hi pondball,

(Could be my 'golf name' somedays)

Formula in Handicap::B2 and filled to the bottom and right at Handicap::X4

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But also has the advantage of af being able to require an "exact match" search value.

Here's the same tables of two, with VLOOKUP replacing LOOKUP. Note that the VLOOKUP function has a different syntax than the LOOKUP function.

Formula VLOOKUP in Handicap::B2, filled with verse down and right at Handicap::X4:

= IF (VLOOKUP ($A, Data: $A:$ X, COLUMN (), FALSE) = 0,"", VLOOKUP ($A, Data: $A:$ X, COLUMN (), FALSE) ")

Written as above, the formula works correctly in rows 2 and 3, but will just return the error in the 4th row triangles, since it will not find a match (exact n) for 'Us' in column A of data.

After confirming that it produces no unexpected error, wrap the formula in function SIERREUR as shown below and repeat the filling down and the right filling operations above.

SIERREUR function interrupt all errors, including those affecting the results without your knowledge if they occur. Always delay adding IFERROR until you know what are the errors he fools.

=IFERROR (IF (VLOOKUP ($A, data: $A:$ X, COLUMN (), FALSE) = 0,' ", VLOOKUP ($A, data: $A:$ X, COLUMN (), F ALSE))," ")

Y2: = COUNT (C2:X 2)

Z2: = AVERAGE(C2:X2) (base form)

Z2: = IF (Y = 0,' ", AVERAGE (C2:X 2)) (real form)

The encapsulation of the AVERAGE function in the IF statement deletes the calculation if the number of items to the average value is zero, AVERAGE preventing from return to a division by zero error. The number of circles in the column there is NOT used in the calculation of the average (AVERAGE did his own count), but is used as a switch 'OK to calculate' leaving the calculation of the AVERAGE to move forward.

Kind regards

Barry

use the contents of the cell to a cell reference of formula calculate

In Apple "Numbers", in order to update a spreadsheet each time that the values are added, I first need to calculate the number of days between the date of first entry and last date, using the COUNTA() method. Gives me the line number of the last entry. For this I "CONCATENATE" a column letter known to a cell reference.

Using this cell reference, I would like to know how can I use the contents of the cell to update the information contained in the rest of the worksheet. Is this possible?

Any help would be appreciated.

Thanks in advance.

I have a problem following exactly what you want to do, but think that INDIRECT can help. More here.

SG

Them	A	78																						1	78
Me	Me	80	75	81	0	81	77																	6	65.6666666666667	-10

The 'cell factory?", what exactly is

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